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THE SUPERSTITION CAULDRON COMPLEX by Michael F

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THE SUPERSTITION CAULDRON COMPLEX by Michael F THE SUPERSTITION CAULDRON COMPLEX by Michael F. Sheridan Department of Geology Arizona State University This one-day field trip examines the rock types, stratigraphy, struc­ ture and petrology of the volcanic units associated with the Supersti­ tion cauldron complex. Most stops are located along the Apache Trail, but there will be some hikes across rugged desert terrain. INTRODUCTION cauldron and the Tortilla caldera. Earlier-described cal­ The Superstition-Superior volcanic field is one of several deras are superceded by these structures as defined by their mid-Tertiary silicic centers in the Basin and Range province boundary faultson this map. of southern Arizona. Tuffs associated with this field cover an irregular area approximately 100km in diameter (fig. 1). The geology of the westernpart of this fieldhas been inves­ tigated by students at Arizona State University (Fodor, 1968; Stuckless, 1969, 1971; Malone, 1972; Sedgeley, 1976; Suneson, 1976; and Hillier, 1977). Rocks in the east­ ern part of the field have been examined by U.S. Geologi­ cal Survey scientists (D. W. Peterson, 1960, 1961, 1968, 1969; Creasy and others, 1975; N. P. Peterson, 1954, 1962, 1963; Peterson and others, 1951; and Ransome, 1903, 1919). DIIIl1IIII Tortilla Caldera < 15m.y. � Goldfield Caldera 15-16 my. � Superstition Caldera 25 m.y. 60,70 10 15 20 25Km 80,89 Figure 2. Detail of the three principal cauldrons. Main faults shown with the ball on the down-dropped side. Mes■ Apaeh• Junetlon In this report cauldron is used to describe a large sub­ / circular volcanic collapse structure, the topographic expres­ I I sion of which has been erased by erosion. Caldera refers to I a similar collapse structure that retains some or all of its I topographic rim. In this sense the Superstition and ,_ Goldfieldstructures are cauldrons, but the Tortilla structure is a caldera. The Superstition resurgent cauldron is filled 10 20Km with a thick section of welded tuffthat has been arched up to produce a broad dome with a central graben. The Figure 1. Distribution of volcanic rocks associated with the Super­ Goldfield cauldron is composed of at least three tectonic stition-Superior field. Superstition cauldron (S), Goldfield cauldron (G), and Tortilla caldera (T) are indicated by the line pattern. blocks tilted to the northeast (fig. 5) so that the southwest half of the structure has little or no vertical displacement and relatively thin infill units. The Tortilla caldera is an Sheridan and others ( 1970) were the first to recognize arcuate graben filled with lahar that lies within a topo­ large cauldrons in the Superstition area. Subsequent map­ graphic rim capped with a rhyolite lava. ping has confirmed the existence of the Superstition caul­ The stratigraphy of the Superstition area is now fairly dron and defined its limits. However, a revised interpre­ well known, although several significant questions still re­ tation (fig. 2) shows two new structures, the Goldfield main unanswered. Figure 3 shows stratigraphic columns for 85 I I 15.2m.y. 2000 16.3m¥- Figure 3. Stratigraphic columns: 1) Precambrian granite, 3) latite com­ I: plex, 4) Siphon Draw member, Super­ stition Tuff, 6) breccia of First Water, 8 & 9) rhyodacite domes and lavas, 10) Geronimo Head tuffs, 11) Geronimo Head lavas, 12) Canyon Lake mem­ 1000 ber, Superstition Tuff, 14) breccia 24.4mr of Mesquite Flat, 15) basalt of Willow Spring. Goldfield Caldera 0 Superstition thickness Caldera in meters infill deposits of the Superstition and Goldfield cauldrons. The Goldfield caldera sequence began at a slightly later Documentation of the ages was done by Damon (1969) and time with the extrusion of rhyodacite domes, lavas, and IC Stuckless and Sheridan (I 971). There are two principal breccias at 20 to 21 m.y., coincident with similar lavas in stratigraphic units: I) the Superstition Tuff, a rhyodacite the Superstition caldera. A period of quiet was followedby l:C welded tuff composed of several members, and 2) the the eruption of the Geronimo Head tuffsand lavas resulting Geronimo Head Formation, a rhyolitic non-welded tuffand in major caldera collapse at 16 m .y. A final phase of activ- g; lava sequence. ity fromthis caldera produced the Canyon Lake member of The oldest volcanic rocks of the Superstition cauldron are the Superstition tuff, a 15 m.y. old welded tuff sheet that ti; alkali basalts that are interbedded with or overlie arkosic extends at least 20 km northeast of the caldera rim. conglomerates. The major volcanic episode began with the The stratigraphy of the Tortilla caldera is not yet well extrusion of a ring of latite domes during a period from 29 documented by radiometric dates. Basalt and latite similar to 25 m.y. ago. This phase ended with the eruptionof the to that of the Superstition cauldron occur northeast of the Siphon Draw member of the Superstition Tuff and collapse structure in Horse Mesa. Rhyodacite lava similar to that of of the Superstition caldera at 25 m.y. ago. A period of the Goldfield cauldron is located along the northern caldera resurgence marked by rhyodacite lavas dated at 20 to 21 rim beneath a thick sequence of tuffs and lavas similar to m.y. was followed by caldera infill by the breccia of First those of the Geronimo Head Formation. The most distinc­ Water and the post-caldera basanite of Black Mesa. tive units in this caldera are the rim rhyolite lava and its 10 F ALK Figure 4. Chemical variation diagrams for volcanic rocks from the Supersti­ 06N � 5 tion cauldron complex. (From Sune­ + : ... son, 1976.) .. 0 4 N SUBALK < 3 ,' z o--�---�---�--�- 40 48 56 64 72 80 A M Si02 86 associated graben-filling lahar. Above and ti'elow the lahar Hillier,Mark, 1978, A geochemical study of the older dacite complex, are thin alkali basalt flows. Superstition Mountains,Arizona: Tempe,Arizona, Arizona State University,M.S. thesis. The rocks of this complex fall into two •petrographic Lipman, P. W., Prostka, H. J., and Christiansen, R. L., 1972, suites (fig. 4). The dominant series is composed of calc­ Cenozoic volcanism and plate-tectonic evolution of the western alkali silicic rocks ranging from latites through rhyolites. United States. I. Early and Middle Cenozoic: Phil. Trans. R. Soc. Land.,ser. A,v. 271,p. 217-248. However, a minor series of alkali basalts occurs below and Malone, G. B., 1972, The geology of the volcanic sequence in the above the major silicic sequence. Data fromisotopic studies Horse Mesa area, Arizona (M .S. thesis): Tempe, Arizona, (Stuckless and O'Neil, 1973) and petrologic models Arizona State University,68 p. Peterson,D. W.,1960, Geology of the Haunted Canyon quadrangle, (Malone, 1972; Stuckless, 1971) suggest an independent Arizona: U.S. Geol. Survey Map GQ-128. origin foralkalic and calc-alkalic suites. The transition from Peterson, D. W., 1961, Dacite ash-flow sheet near Superior and calc-alkali to basalt volcanism in this area at 15 to 18 m.y. Globe, Arizona (Ph. D. thesis): Stanford, California, Stanford (Suneson and Sheridan, 1975) is consistent with similar University,130 p. Peterson, D. W.-, 1966, Geology of Picket Post Mountain, northeast changes throughout the Basin and Range province (Lipman Pinal County,Arizona: Ariz. Geol. Soc. Dig.,v. 8,p. 159-176. and others, 1972). Peterson, D. W., 1968, Zoned ash-flow sheet in the region around Superior, Arizona: Ariz. Geol. Soc. Southern Arizona Guidebook III,p. 215-222. Peterson, D. W., 1969, Geologic map of the Superior quadrangle, TABLE I-SYMBOLS FOR MAP UNITS Arizona: U.S. Geol. Survey Map GQ-818. Peterson, N. P., 1954, Globe, Arizona-Geology: U.S. Geol. Survey Map GQ-41. Peterson, N. P., 1962, Geology· and ore deposits of the Globe-Miami B3 basalt of Willow Springs district,Arizona: U.S. Geol. Survey Prof. Paper 342,151 p. Peterson, N. P., 1963, Geology of the Pinal Ranch quadrangle, BRm breccia of Mesquite Flat Arizona: U.S. Geol. Survey Bull,1141-H, 18 p. Peterson, N. P., Gilbert, C. M., and Quick, G. L., 1951, Geology RH rhyolite of HorseMesa and ore deposits of the Castle Dome area, Gila County, Arizona: U.S. Geol. Survey Bull. 971,134 p. B2 basalt of Canyon Lake Ransome,F. L.,1903, Geology of the Globe copper district,Arizona: U.S. Geol. Survey Prof. Paper 12,168 p. Sc Canyon Lake member,Superstition Tuff Ransome, F. L. 1919, The copper deposits of Ray and Miami, Arizona: U.S. Geol. Survey Prof. Paper 115,192 p. H. Gt tuffs of Geronimo Head Formation Schmincke, U., 1967, Graded lahars in the type section of the Ellensburg Formation,south central Washington: Jour. Sed. Pet., GI iavas of Geronimo Head Formation v. 37,p. 438-448. Sedgeley, D.R., 1976, A paleomagnetic study of some welded tuffs Bl basalt of Black Mesa in central Arizona: Tempe, Arizona, Arizona State University, M.S. Thesis, llOp. BRo breccia of First Water Sheridan,M. F.,Stuckless, J. S., and Fodor, R. V.,1970, A Tertiary silicic cauldron complex at the northern margin of the Basin and RD rhyodacite lavas Range province, central Arizona, U.S.A.: Bull. Volcanol., v. 34,p. 649-662. Ss Siphon Draw member,Superstition Tuff Stuckless, J. S., 1969, The geology of the volcanic sequence as­ sociated with the Black Mesa caldera, Arizona (M .S. thesis): LT latite lavas,breccias, and domes Tempe,Arizona, Arizona State University,79 p. Stuckless, J. S., 1971, The petrology and petrography of the volcanic Bo older basalts sequence associated with the Superstition caldera, Superstition Mountains, Arizona (Ph. D. thesis): Stanford, California, Stan­ AK arkosic conglomerate ford University,112 p. Stuckless, J. S., and O'Neil, J. R., 1973, Petrogenesis of the GR Precambrian granite Superstition-Superior volcanic area as inferred from strontium­ and oxygen- isotope studies: Geol.
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